Definition of observe

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observer >

ob·serve    (b-zûrv) KEY 

VERB:
ob·served, ob·serv·ing, ob·serves
VERB:
tr.

1. To be or become aware of, especially through careful and directed attention; notice.
2. To watch attentively: observe a child's behavior.
3. To make a systematic or scientific observation of: observe the orbit of the moon.
4. To say casually; remark.
5. To adhere to or abide by: observe the terms of a contract.
6. To keep or celebrate (a holiday, for example): observe an anniversary.

VERB:
intr.

1. To take notice.
2. To say something; make a comment or remark.
3. To watch or be present without participating actively: We were invited to the conference solely to observe.

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ETYMOLOGY:
Middle English observen, to conform to, from Old French observer, from Latin observre, to abide by, watch : ob-, over ; see ob- + servre, to keep, watch; see ser-¹ in Indo-European roots

OTHER FORMS:
ob·serving·ly(Adverb)

SYNONYMS:
observe, keep, celebrate, commemorate, solemnize

These verbs mean to give proper heed to or show proper reverence for something, such as a rule, custom, or holiday. Observe stresses compliance or respectful adherence to that which is prescribed: observe the speed limit; observe the Sabbath. Keep implies actions such as the discharge of a duty or the fulfillment of a promise: keep one's word; keep personal commitments. Celebrate emphasizes observance in the form of rejoicing or festivity: a surprise party to celebrate her birthday. To commemorate is to honor the memory of a past event: a ceremony that commemorated the career of a physician. Solemnize implies dignity and gravity in the celebration of an occasion: solemnized the funeral with a 21-gun salute. See also Synonyms at see¹.